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Signed-off-by: Rodrigo Siqueira --- Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst b/Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst index 6dbd21f7f59e..40c55a618918 100644 --- a/Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst +++ b/Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst @@ -58,3 +58,20 @@ In this case, if you have a pipe split, you will see one small red bar at the bottom of the display covering the entire display width and another bar covering the second pipe. In other words, you will see a bit high bar in the second pipe. + +DTN Debug +========= + +DC (DCN) provides an extensive log that dumps multiple details from our +hardware configuration. Via debugfs, you can capture those status values by +using Display Test Next (DTN) log, which can be captured via debugfs by using:: + + cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + +Since this log is updated accordingly with DCN status, you can also follow the +change in real-time by using something like:: + + sudo watch -d cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + +When reporting a bug related to DC, consider attaching this log before and +after you reproduce the bug. -- 2.25.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7E27C4332F for ; Thu, 25 Nov 2021 15:41:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232720AbhKYPo4 (ORCPT ); Thu, 25 Nov 2021 10:44:56 -0500 Received: from mail-dm6nam11on2048.outbound.protection.outlook.com ([40.107.223.48]:17377 "EHLO NAM11-DM6-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S235204AbhKYPmz (ORCPT ); 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Nov 2021 15:39:38.6593 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ad29d254-8130-40dc-ebb2-08d9b029ca7d X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT063.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4456 Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Introduce how to collect DTN log from debugfs. Signed-off-by: Rodrigo Siqueira --- Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst b/Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst index 6dbd21f7f59e..40c55a618918 100644 --- a/Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst +++ b/Documentation/gpu/amdgpu-dc/amdgpu-dc-debug.rst @@ -58,3 +58,20 @@ In this case, if you have a pipe split, you will see one small red bar at the bottom of the display covering the entire display width and another bar covering the second pipe. In other words, you will see a bit high bar in the second pipe. + +DTN Debug +========= + +DC (DCN) provides an extensive log that dumps multiple details from our +hardware configuration. Via debugfs, you can capture those status values by +using Display Test Next (DTN) log, which can be captured via debugfs by using:: + + cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + +Since this log is updated accordingly with DCN status, you can also follow the +change in real-time by using something like:: + + sudo watch -d cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log + +When reporting a bug related to DC, consider attaching this log before and +after you reproduce the bug. -- 2.25.1